<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>两列式布局</title>
    <style>
    * {
        margin: 0;
        padding: 0;
    }
    .container{
        /* display: flex; */
    }
    .aside, .main {
        height: 500px;
    }
    .aside {
        float: left;
        width: 300px;
        background-color: green;
    }
    .main {
        /* flex: 1; */
        background-color: red;
        /* margin-left: 300px; */
        overflow: hidden;
        /* float: left;
        width: left calc(100% -300px); */
    }
    </style>
</head>
<body>
    <!-- 设计一套布局， 两列式布局   aside  300px , 剩下的交给 main
        左右
        侧边栏固定宽度 主栏宽度自适应
    -->
    <div class="container">
        <aside class="aside"></aside>
        <main class="main"></main>
    </div>
</body>
</html>